Paul, writing in the comments, asks me where I'm going in Pennsylvania at the end of the month.
Well, the bulk of my trip will be to Hanover, where I'll be visiting my uncle, who is President and CEO of Snyder's of Hanover. (Yes, you read right--I am in the penumbra of a pretzel dynasty.) After a day of touring the factory and (one presumes) gorging myself on free samples, my brother and I scheduled one free day before we fly home via Baltimore.

We do not, however, have any clue what to do. Knowing this, I turn to my dear readers, some of whom know the area well. Anything within a couple hours' drive of Hanover/Baltimore is in play.